Metallurgical furnace



B. G. LAUTH.

METALLURGICAL FURNACE.

(No Model.)

Patented Nov. 23,1897.

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UNITED STATES PATENT OFFICE.

, BERNARD C. LAUTH, OF PITTSBURG, PENNSYLVANIA.

M ETALLU RGICAL FU RNAC E.

SPECIFICATION forming part of Letters Patent No. 594,112, dated November23, 1897.

Application filed April 6, 1896. Serial No- 586,301- (Nomodel-l To aZZwhom it may concern:

Be it known that I, BERNARD O. LAUTH, a resident of Pittsburg, in thecounty of Allegheny and State of Pennsylvania, have invented a new anduseful Improvement in Metallurgical Furnaces; and I do hereby declarethe following to be a full, clear, and exact description thereof.

My invention relates to metallurgical furnaces, its object being toprovide a simple straight draft-furnace more particularly for heatingwith solid fuel, though it may be employed with gaseous fuel, and toutilize the heat both by radiation, direct contact with the metal to beheated, and the retarding of the heated gases in their course throughthe furnace-chamber.

In an application of even date herewith,

I Serial No. 586,300, the furnace embodying my present invention isillustrated and included in the generic claim contained therein.

The present invention comprises, generally stated, a furnace having afire-chamber at one end and a neck or outlet flue at the other end andbetween them a hearth, while it is provided with a peaked roof formed ofstraight upwardly-inclined roof-walls extending from the ends of thefurnace at an angle of not less than twenty-five degrees from thehorizontal and meeting at about the center of 1 the hearth and forming ahigh furnace-chamber over the hearth, the furnace having a neck oroutlet which is narrower than the hearth and located below the lower endof the peaked roof. As so constructed it provides for the heating of themetal upon the hearth both by radiation from the top Wall as the gases,flame, or heated products pass upwardly along the straight roof-walluntil they reach the peak on their route, when they are deflecteddownwardly into the furnacechamber and into contact with the metal onthe hearth and are also retarded within the furnace-chamber in theircourse to the narrow neck leading therefrom at or about the level of thehearth.

To enable others skilled in the art to make and use my invention, Iwilldescribe the same more fully, referring to the accompanying drawings, inwhich- Figure 1 is a vertical central section of a heating-furnaceembodying my invention;

and Fig. 2 is a horizontal cross-section on the line 2 2, Fig. 1.

Like letters of reference indicate like parts in each view.

The furnace illustrated in the drawings which embodies the presentinvention has the side walls a b, the side wall 1) containing theordinary working doors 0 .and the furnace having the end wall cZ at oneend and the outlet-flue e at the other end leading to the stack or otherexit for the gases, as at f. The furnace illustrated is aheating-furnace having the hearth g, while ithas the regular bridgewallh.

I will now describe the peculiarities of construction of the furnaceembodying the present invention. It will be noticed that the furnace hasa high furnace-chamber Zc, which is formed by the straight roof-wallsmeeting over the center or peak is of the f urnace-chamber, the wall Zextending at an angle of not less than twenty-five degrees from the endwall cZ upwardly to the peak Z, while the wall m extends up-atanangle'from the end wall n in the opposite direction to the peak Z, thefurnace therefore having a straight peaked roof formed of straightupwardly-inclined roof-walls Z and m meeting at the peak Z. It will benoticed that the neck or outlet-flue e is located below the lowest pointof the inclined roof-wall m, the end wall n of the furnace extendingover the neck c, as at n, so that the gases are compelled to passdownwardly after reaching the lower end of the peaked roof to reach theneck or outlet-flue c. It will also be noticed that this outletflue isnarrower than the body of the furnace, and that on each side thereof arethe end walls it above referred to, which are formed at substantiallyright angles to the side walls, so compelling the gases not only to passdownwardly, but to pass inwardly from the side walls to reach the neck6. Though the faces of the end walls may be slightly changed as toangle, it is desirable that they shall cause the downward movement ofthe gases and the inward movement thereof toward the neck, so acting toretard the gases in their flow through the furnace-chamber, and that theflame and heated gases shall be compelled to pass downwardly close tothe hearth before escaping from the chamber.

When the furnace as above constructed is in use, the fire is startedwithin the firechamber p, air being supplied to the same in any suitableway, and the gases, flame, and heated products pass out of thisfire-chamber along the upwardly-inclined roof-wall Z, so that the heattherefrom is radiated down from this roof-wall in the highfurnace-chamber 70 upon the hearth g, and the heat from the gases isfirst utilized by radiation. As the gases reach the apex of the furnacethey strike the roof-wall m, extending in the opposite incline, and partthereof will be deflected by this roof-wall down onto the hearth and bebrought into direct contact with themetal thereon. The mass of the flameand gases are deflected in their course, having a swirling motion withinthe furnace-chamber, and any gases which will hug the wall m arecompelled to pass in a downward course along the same,and the heattherein will be radiated upon the metal on the hearth. These gases arecompelled to pass downwardly by the upper portion 1 of the end wall '17,of the furnace, which causes a swirling motion of these gases,deflecting them downwardly upon the portion of the hearth near the neckand into contact with the metal thereon. This downward course of thegases also causes the backward swirling motion of the gases firstdeflected down at the apex of the roof, the gases being thus retarded intheir course to the outlet-flue in such way as to utilize practicallyall the heat contained therein either by radiation or by direct contactwith the metal. The gases are further retarded in their course to theneck by the portions of the end wall on each side of the outlet-fluewhich compel the gases to pass inwardly from the side walls to suchflue.

The furnace is simple in construction, and practical use has shown thata very high heat can be obtained therein and practically all the heatutilized within the furnace-chamber, and that an even heat may bemaintained throughout the furnace-chamber.

, What I claim as my invention, and desire to secure by Letters Patent,is

1. A metallurgical furnace having a firechamber at one end, anoutlet-flue at the other and a hearth between them, and having a peakedroof formed of straight upwardly-inclined roof-walls extending at anangle of not less than twenty-five degrees from the hori- 'zontal fromthe ends of the furnace over the hearth and meeting atabout the centerthereof, and forming a high furnace-chamber, substantially as and forthe purposes set forth.

2. A metallurgical furnace having a fire- 1 chamber at one end, ahearth, and an end wall at the other end, and an outlet-flue leadingfrom the same below the top of the wall and narrower than the hearth,and having a peaked roof formed of straight upwardly-inclined roof-Wallsextending at an angle of not less than twenty-five degrees from thehorizontal from the end walls over the hearth and meeting at or aboutthe center thereof and forming a high furnace-chamber, substantially asand for the purposes set forth. In testimony whereof I, the said BERNARDC. LAUTH, have hereunto set my hand.

BERNARD O. LAUTI-I. WVitnesses:

J AMES I. KAY, ROBERT C. TOTTEN.

